Overnight Mashing

You're a truly sick puppy. I like that in a person.

 

So I tried it with my APA rather than my lower gravity English Bitter. My temperature dropped 10-15 degrees over 7 hours. My mash tun was wrapped in an electric blanket and sleeping bag for extra insulation. I did not have the means to put a layer of CO2 over the mash like jbakajust1, but there is nothing amiss about the taste of the wort.

My extraction efficiency was 76%; I usually plan for 72%. One interesting thing about the batch is the difference between the first and second runnings. The first runnings accounted for 75% of the extract. Usually it's closer to 66% in my experience. Makes me think that if I ever did no sparge, I might want to try a longer mash time? Speculative, anecdotal stuff.